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    问题：
    无法函数复用，超类原型中的方法对子类不可见
    <script>
    function Animal(){
        this.spacies = '动物'
    }    
    function Cat(naem, color){
        Animal.apply(this, arguments);
        this.name = name;
        this.color = color;
    }
    var kiti = new Cat('kiti','white');
    console.log(kiti);

    </script>
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